Searching for plastic guide on top of closet sliding g

A quick learner says:
this plastic piece fits on top of the closet sliding glass door.
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Tom from SWISCO responded:

Thank you for your patience during this busy season. This guide looks like it might be part of a larger assembly. I think there might be a metal housing still in the door. If there is, can you show it to me?

A quick learner from Palm City, FL says:
Hope this helps. Thanks for tour assistance.
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Tom from SWISCO responded:

That helps, thanks. Take a look at our 23-044. Look over the dimensions and let me know if you think this matches up. 

A home owner from Palm City, FL says:
Just want to thank you for finding the slider part I have been trying to find for quite a while. I really appreciate your effort and will definitely tell my son and neighbors about your service. as you probably know, I ordered 2 of them after hearing from you.
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